Across
- 5. special region of the heart that sets the tempo of the heartbeat
- 6. tiy air sacs in the lungs
- 8. selects which information to pass on
- 10. a nervous system that is made up mostly of nerves that carry signals into and out of the CNS
- 12. prepares the body for intense, energy-consuming activities
- 15. a sheet of muscle that borders the bottom of the lungs
- 16. the alternating processes of inhalation and exhalation
- 18. circulatory system in which the circulating fluid is pumped through open-ended vessels and flows out among the cells
- 19. the movement of molecules along a concentration gradient, from an area of higher concentration to lower concentration
- 21. voice box
- 24. short, numerous, and highly branched extensions
- 25. when the heart is relaxed and blood flows in
- 26. the force that blood exerts against the walls of your blood vessels
- 29. bits of cytoplasm pinched off from larger cells in the bone marrow
- 30. part of brain that controls breathing
Down
- 1. the voltage across the plasma membrane of a resting neuron
- 2. carries blood away from the heart
- 3. a type of breathing when air rushes in through your mouth and nostrils toward the region of lower pressure
- 4. a gelatinous bundle of nerve fibers that lies inside the spinal column
- 7. an extensive system of internal tubes that branch throughout the body
- 9. part of an animal where oxygen from the environment diffuses into living cells and carbon dioxide diffuses in the surrounding environment
- 11. involves extreme mood swings
- 13. planning center for body movements
- 14. where the digestive and respiratory systems meet
- 17. extensions, or outfoldings, of the body surface where the respiratory surfaces are found in aquatic animals
- 20. a nervous system that carries signals to and from skeletal mucles, mainly in response to external stimuli
- 22. circulatory system in which blood is confined to vessels and is distinct from the intersitial fluid
- 23. returns blood back into the heart
- 27. one of the deadliest forms of cancer
- 28. circuit that carries blood between the heart and the lungs